The River Ock is a tributary

Tributary

A tributary or affluent is a stream or river that flows into a main stem river or a lake. A tributary does not flow directly into a sea or ocean...

 of the River Wey

River Wey

The River Wey in Surrey, Hampshire and West Sussex is a tributary of the River Thames with two separate branches which join at Tilford. The source of the north branch is at Alton, Hampshire and of the south branch at both Blackdown south of Haslemere, and also close to Gibbet Hill, near Hindhead...

 in Surrey

Surrey

Surrey is a county in the South East of England and is one of the Home Counties. The county borders Greater London, Kent, East Sussex, West Sussex, Hampshire and Berkshire. The historic county town is Guildford. Surrey County Council sits at Kingston upon Thames, although this has been part of...

, England

England

England is a country that is part of the United Kingdom. It shares land borders with Scotland to the north and Wales to the west; the Irish Sea is to the north west, the Celtic Sea to the south west, with the North Sea to the east and the English Channel to the south separating it from continental...

.

The river rises near Hambledon

Hambledon, Surrey

Hambledon is a small and scattered village in Surrey, south of Guildford. It is tucked away amongst fields and woodland between Witley and Chiddingfold....

 and then flows north between Enton

Enton

Enton is a hamlet in the civil parish of Witley in the Waverley district of Surrey, England. Its nearest town is Godalming, which lies approximately north-east from the hamlet....

 and Witley

Witley

Witley, in Surrey, England is a village south west of Godalming. The village lies just east of the A3 that runs from Guildford to Petersfield. Witley together with the neighbouring area of Hambledon have a population of about 4,000. Neighbouring villages include Milford, Chiddingfold and...

, then past Wheelerstreet

Wheelerstreet

Wheelerstreet is a large village and civil parish in the Waverley district of Surrey, England. Its nearest town is Godalming, which lies north-east from the village....

 and Milford

Milford, Surrey

Milford is a large village, situated south west of Godalming in Surrey, England. Nearby villages include Witley, Elstead and Eashing, and the hamlets of Enton and Hydestile. It is situated in the Borough of Waverley.-Transportation:...

. It is then joined by a tributary which flows through Busbridge Lakes. It then passes through Ockford, named for the stream, before flowing into the Wey at Godalming

Godalming

Godalming is a town and civil parish in the Waverley district of the county of Surrey, England, south of Guildford. It is built on the banks of the River Wey and is a prosperous part of the London commuter belt. Godalming shares a three-way twinning arrangement with the towns of Joigny in France...

. In Godalming, the Westbrook Mill lies on the river.

For much of its length, the Portsmouth Main Line follows the river.